<div>
  <label>
    Dot size ratio
    <icon-tip
      content="'Change the ratio of the radius of the smallest point to the largest point'"
      position="'right'"
    ></icon-tip>
  </label>
  <input type="range" step="2" min="1" max="100" class="form-control" ng-model="vis.params.radiusRatio" />
</div>
